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Fig. 1

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Colour − colour diagram (YK vs. JK) for the stars from a combined UKIDSS/2MASS catalogue (top panel) and for the 2MASS stars of the MRC 1017-220 field (bottom panel), shown as an example for the calibration of the Y-band HAWK-I data. Stars are well fitted by an empirical colour − colour relation, (YK)Vega = 1.45 × (JK)Vega (solid line). The standard deviation (0.07) of the distribution is shown by the dotted lines.

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